Motor Protection Principles.pdf
Motor Protection Principles.pdf
Motor Protection Principles.pdf
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Ground Fault <strong>Protection</strong><br />
• A ground fault is a fault that creates a path<br />
for current to flow from one of the phases<br />
directly to the neutral through the earth<br />
bypassing the load<br />
• Ground faults in a motor occur:<br />
• When its phase conductor’s insulation is<br />
damaged for example due to voltage stress,<br />
moisture or internal fault occurs between the<br />
conductor and ground<br />
• To limit the level of the ground fault current<br />
connect an impedance between the<br />
supplies neutral and ground. This<br />
impedance can be in the form of a resistor<br />
or grounding transformer sized to ensure<br />
maximum ground fault current is limited.<br />
26
Change language